A system-in-package (SiP) includes a RDL structure having a first side and a second side opposite to the first side; a first semiconductor die mounted on the first side of the RDL structure, wherein the first semiconductor die has an active surface that is in direct contact with the RDL structure; a plurality of conductive fingers on the first side of the RDL structure around the first semiconductor die; a second semiconductor die stacked directly on the first semiconductor die, wherein the second semiconductor die is electrically connected to the plurality of conductive fingers through a plurality of bond wires; and a mold cap encapsulating the first semiconductor die, the conductive fingers, the second semiconductor die, and the first side of the RDL structure.